CN113496795A - GIL post insulator and interface stress detection method thereof - Google Patents
GIL post insulator and interface stress detection method thereof Download PDFInfo
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- CN113496795A CN113496795A CN202110621976.0A CN202110621976A CN113496795A CN 113496795 A CN113496795 A CN 113496795A CN 202110621976 A CN202110621976 A CN 202110621976A CN 113496795 A CN113496795 A CN 113496795A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/14—Supporting insulators
- H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
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Abstract
The invention relates to the technical field of high-voltage electric tests and discloses a GIL post insulator which comprises an epoxy insulator and a metal insert, wherein the epoxy insulator is provided with an insert mounting cavity, the outer surface of the metal insert is provided with a high-temperature strain gauge, the metal insert is mounted in the insert mounting cavity, and the high-temperature strain gauge is positioned between the epoxy insulator and the metal insert. The GIL post insulator directly, efficiently and accurately acquires the detection data of the metal-epoxy interface. The high-temperature strain gauge can monitor the strain change of the epoxy-metal insert interface of the epoxy insulator in the pouring process, and after the experimental post insulator is formed, a strain test experiment of externally applying acting force is performed on the experimental post insulator, so that the strain change of the metal-epoxy interface in the whole process of casting molding-fracture is monitored.
Description
Technical Field
The invention relates to the technical field of high-voltage electric tests, in particular to a GIL post insulator and an interface stress detection method thereof.
Background
The SF6 Gas insulated transmission line (GIL) has the advantages of low transmission loss, low capacitive load, large transmission energy, high safety and reliability, no electrical aging and the like, and is increasingly widely applied to domestic and foreign power systems. Post insulators are important parts in GIL equipment and mainly serve as insulation and mechanical supports, and operating experience shows that post insulator leg breakage is a main cause of failure. With the increase of GIL devices in the operation of a power grid, the number of accidents caused by the breakage of the post legs of the post insulators is obviously increased, so that the technology for improving the bonding strength of the epoxy-metal insert interface becomes a research hotspot for reducing the failure rate of the post insulators.
The epoxy-metal insert interface is a weak link of mechanical strength, not only is the interface the most stress-concentrated area under ideal conditions, but also one reason is that the epoxy material is easy to form stress concentration on the surface of the metal insert during the casting process, which causes uneven curing or weak bonding to form small air gaps. Therefore, not only needs to optimize the structural design, but also needs to improve the material formulation process to improve the bonding strength of the epoxy-metal interface. The increase in the bonding strength of the epoxy-metal insert interface can be initiated from a number of aspects, such as changing the epoxy material formulation and casting process, oxidizing treatment and knurling process of the metal insert, coating a buffer material between the metal insert and the epoxy, and the like.
In the prior art, the adhesion strength improvement effect is evaluated by mainly sticking a strain gage on the surface of a column leg of an epoxy insulator to measure the surface strain of the epoxy and the fracture strength of an epoxy-metal insert interface, and the method has two defects: 1) the compatibility of the epoxy material and the metal insert in the casting process is not concerned, namely the strain change in the casting process; 2) the measurement result is the surface deformation of the column leg, the deformation and the stress of the epoxy-metal insert interface are derived by combining simulation modeling calculation, the three-column insulator is assumed to be uniformly distributed in the calculation process, the epoxy-metal insert interface is an ideal interface, process details such as knurling, gluing and the like can be ignored, and the calculation result has non-negligible deviation from an actual value.
Disclosure of Invention
The purpose of the invention is: the GIL post insulator can directly, efficiently and accurately acquire the detection data of the metal-epoxy interface.
Meanwhile, the interface stress detection method of the GIL post insulator can be used for more comprehensively acquiring the interface stress data of the epoxy-metal insert.
In order to achieve the purpose, the invention provides a GIL post insulator which comprises an epoxy insulator and a metal insert, wherein the epoxy insulator is provided with an insert mounting cavity, the outer surface of the metal insert is provided with a high-temperature strain gauge, the metal insert is mounted in the insert mounting cavity, and the high-temperature strain gauge is positioned between the epoxy insulator and the metal insert.
Preferably, a stress most concentration point is arranged between the epoxy insulator and the metal insert, a preset distance L is reserved between the high-temperature strain gauge and the stress most concentration point, and L is greater than 0.
Preferably, the high-temperature strain gauge comprises a strain gauge body and a connecting wire, the strain gauge body is connected with one end of the connecting wire, the other end of the connecting wire penetrates out of the metal insert, and the strain gauge body is attached to the surface, facing the epoxy insulator, of the metal insert.
According to a preferable scheme, the metal insert is provided with a lead hole, one end of the metal insert, which faces away from the epoxy insulator, is provided with an insert cavity, the inner side surface of the insert cavity is provided with a lead groove, the connecting wire is arranged in the lead groove, and the connecting wire sequentially passes through the lead hole and the lead groove and penetrates out in a direction facing away from the epoxy insulator.
A GIL post insulator interface stress detection method comprises the following steps:
step 1: the high-temperature strain gauge is adhered to an adhering surface of the metal insert and the epoxy insulator, and the arrangement position of the high-temperature strain gauge on the metal insert GIL post insulator interface stress detection method is determined according to the required monitoring position;
step 2: according to the arrangement position, a lead hole is formed in the metal insert, an insert cavity is formed in one end, back to the epoxy insulator, of the metal insert, the lead hole extends to the insert cavity from the arrangement position, a lead groove is formed in the inner side face of the insert cavity, the high-temperature strain gauge comprises a strain gauge body and a connecting wire, and the depth of the lead groove is larger than the diameter of the connecting wire;
and step 3: the strain sheet body is adhered to the arrangement position of the adhering surface of the metal insert, one end of the connecting wire is connected with the strain sheet body, and the other end of the connecting wire sequentially penetrates through the lead hole and the lead groove and then extends out of one end of the metal insert, which is opposite to the epoxy insulator, and is connected with a data acquisition device to form an insert data acquisition device;
and 4, step 4: and pouring the epoxy insulator of the GIL post insulator by using the insert data acquisition device, acquiring stress data of an epoxy-metal insert interface in the pouring process of the epoxy insulator by using the insert data acquisition device, and finishing pouring the epoxy insulator to form the experimental post insulator.
Preferably, the method comprises the following steps of 5: and after the epoxy insulator is poured, the experimental post insulator performs a strain test experiment of the external application force.
Preferably, in the step 4, the insert data acquisition device is installed in a mold for casting the epoxy insulator, and data of changes of the strain epsilon and the temperature T along with the time T in the casting process are monitored and acquired.
Preferably, the step 5 includes the following substeps:
step 5.1: taking the experimental post insulator out of the mold, and performing a partial discharge test and an X-ray detection test on the experimental post insulator;
step 5.2: and recording the change data of the strain epsilon and the external application force F by performing a strain test experiment of the external application force F on the experimental post insulator.
Preferably, the method comprises the following steps of 6: and analyzing the material formula and the processing technology of different epoxy insulators by combining the data of the change of the strain epsilon and the temperature T along with the time T in the pouring process, the change data of the strain epsilon and the external application acting force F, the initial voltage of a partial discharge test and the final breaking strength of the strain test experiment.
Preferably, the high-temperature strain gauge is selected at least according to the highest temperature of the casting process of the epoxy insulator, the arrangement position and the strain direction needing to be strategic.
Compared with the prior art, the GIL post insulator provided by the embodiment of the invention has the beneficial effects that: the high-temperature strain gauge is placed between the epoxy insulator and the metal insert, and as the epoxy-metal interface is the weakest link of the mechanical property of the GIL post insulator and the breakage of the post leg of the GIL post insulator is the most common fault type, the bonding failure process of the GIL post insulator needs to be monitored, and the influence rule of the change of the structure and the material formula process on the interface strain and the breakage process analysis are analyzed. The monitoring of the interface strain change in the bonding failure process is realized by arranging the high-temperature strain gauges at different positions of the epoxy-metal interface. Meanwhile, monitoring data can be directly obtained, indirect data obtained through a side monitoring method is not needed to be converted, monitoring efficiency is improved, and data accuracy is improved.
Compared with the prior art, the interface stress detection method for the GIL post insulator has the beneficial effects that: the high-temperature strain gauge is attached to the surface of the metal insert facing the epoxy insulator, then the epoxy insulator is poured, the high-temperature strain gauge can monitor the strain change of an epoxy-metal insert interface of the epoxy insulator in the pouring process, after the experimental post insulator is formed, a strain test experiment of external acting force is carried out on the experimental post insulator, the strain change of the metal-epoxy interface in the whole process of pouring molding-fracture is monitored, the data is richer and more comprehensive than that of only monitoring the fracture process, the influence rule of different material formula processes on the interface bonding performance is favorably compared, the optimization and improvement of epoxy and metal insert materials and process treatment methods are favorably realized, the purpose of improving the bonding strength of the epoxy-metal insert interface is achieved, and the fault rate of the GIL post insulator is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic structural view of an epoxy insulator according to an embodiment of the present invention.
Fig. 3 is a perspective schematic view of a metal insert structure according to an embodiment of the present invention.
Fig. 4 is a schematic side view of a metal insert according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a bonding surface of a metal insert according to an embodiment of the present invention.
Fig. 6 is a schematic view of an insert cavity of an embodiment of the present invention.
In the figure:
10. a GIL post insulator;
20. an epoxy insulator; 21. an insert mounting cavity;
30. a metal insert; 31. a wire hole; 32. a lead slot; 33. an insert cavity;
40. high temperature strain gage.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. used herein are used to indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "connected," "fixed," and the like are used in a broad sense, and for example, the terms "connected," "connected," and "fixed" may be fixed, detachable, or integrated; the connection can be mechanical connection or welding connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 6, a GIL post insulator 10 according to a preferred embodiment of the present invention includes an epoxy insulator 20 and a metal insert 30, wherein the epoxy insulator 20 is provided with an insert mounting cavity 21, an outer surface of the metal insert 30 is provided with a high temperature strain gauge 40, the metal insert 30 is mounted in the insert mounting cavity 21, and the high temperature strain gauge 40 is located between the epoxy insulator 20 and the metal insert 30.
In the GIL post insulator 10, the high-temperature strain gauge 40 is arranged between the epoxy insulator 20 and the metal insert 30, the high-temperature strain gauge 40 is arranged in a built-in mode, and as an epoxy-metal interface is the weakest link of the mechanical property of the GIL post insulator 10 and the column leg fracture of the GIL post insulator 10 is the most common fault type of the GIL post insulator, the bonding failure process of the GIL post insulator needs to be monitored, the influence rule of the change of the structure and the material formula process on the interface strain is analyzed, and the fracture process is analyzed. By arranging the high-temperature strain gauge 40 at different positions of the epoxy-metal interface, the monitoring of the interface strain change in the bonding failure process is realized. Meanwhile, monitoring data can be directly obtained, indirect data obtained through a side monitoring method is not needed to be converted, monitoring efficiency is improved, and data accuracy is improved.
Further, as shown in the schematic view of the leg structure of the three-post insulator in fig. 2, a stress concentration point is located between the epoxy insulator 20 and the metal insert 30, and a preset distance L is located between the high-temperature strain gauge 40 and the stress concentration point, where L is greater than 0. The high temperature strain gage 40 is disposed between the epoxy insulator 20 and the metal insert 30 at a location where no stress is most concentrated. To reduce the effect of the high temperature strain gage 40 on the fracture process, it is avoided to place the high temperature strain gage 40 at the location where the stress is most concentrated, i.e., where the crack first begins. The high temperature strain gage 40 is disposed between the range of 2mm to 5mm in diameter at the most concentrated point of stress.
Further, as shown in fig. 4 to 6, the high temperature strain gauge 40 includes a strain gauge body and a connection line, the strain gauge body is connected to one end of the connection line, the other end of the connection line penetrates out of the metal insert 30, and the strain gauge body is attached to a surface of the metal insert 30 facing the epoxy insulator 20. Monitoring epoxy-metal interface stress variation through the strain sheet body, the data that the monitoring of strain sheet body obtained passes through the connecting wire transmission, and is specific, including data processing apparatus, the other end and the data processing apparatus of connecting wire are connected, and data processing apparatus saves and/or handles the data that high temperature foil gage 40 gathered, and then realizes directly gathering the monitoring to epoxy-metal interface's data, easy operation, detect high-efficient accurate.
Further, as shown in fig. 4 to 6, a lead hole 31 is formed in the metal insert 30, an insert cavity 33 is formed in one end, back to the epoxy insulator 20, of the metal insert 30, a lead groove 32 is formed in the inner side surface of the insert cavity 33, a connecting wire is arranged in the lead groove 32, so that the metal insert 30 is avoided, damage to the connecting wire in the connection process of a casting mold or a fracture experiment tool is avoided, the connecting wire penetrates out from the direction, back to the epoxy insulator 20, of the connecting wire sequentially through the lead hole 31 and the lead groove 32, and the installation of the tool required for the casting or fracture experiment of the epoxy insulator 20 is facilitated. Preferably, the lead groove 32 is formed along the axial direction of the insert cavity 33, the length of the lead groove 32 is as high as the inner side surface of the insert cavity 33, the lead groove 32 penetrates through the inner side surface of the insert cavity 33, the depth of the lead groove 32 is larger than the diameter of a connecting wire, and therefore the connecting wires in the insert cavity 33 can be completely arranged in the lead groove 32, and the influence of the high-temperature strain gauge 40 on the interface performance of the post insulator epoxy-metal insert 30 is reduced to the maximum extent. More specifically, the number of the high temperature strain gauges 40 and the arrangement positions on the metal insert 30 are determined according to the requirements of the monitoring scheme, and the number of the lead holes 31 and the lead grooves 32 is consistent with the number of the high temperature strain gauges 40. Specifically, the inner side surface of the insert cavity 33 is provided with threads, so that the problem of column base installation of the post insulator is considered, and the connecting wire is prevented from being damaged by threaded connection in the insert cavity 33.
A GIL post insulator 10 interface stress detection method is characterized in that: the method comprises the following steps:
step 1: the high-temperature strain gauge 40 is adhered to the adhering surface of the metal insert 30 adhered to the epoxy insulator 20, and the arrangement position of the high-temperature strain gauge 40 on the metal insert 30 is determined according to the required monitoring position; and determining the arrangement position of the high-temperature strain gauge 40 on the metal insert 30 according to the monitoring scheme requirement, and preparing for the opening position of the lead hole 31 and the lead groove 32 at the back. The number of high temperature strain gages 40 is determined by the actual monitoring scheme requirements. The arrangement position of the high temperature strain gauge 40 is avoided from being set at the position where the stress is most concentrated.
Step 2: according to the arrangement position, a lead hole 31 is formed in the metal insert 30, an insert cavity 33 is formed in one end, back to the epoxy insulator 20, of the metal insert 30, the lead hole 31 extends to the insert cavity 33 from the arrangement position, a lead groove 32 is formed in the inner side face of the insert cavity 33, the high-temperature strain gauge 40 comprises a strain gauge body and a connecting wire, and the depth of the lead groove 32 is larger than the diameter of the connecting wire; the connecting line is led out from the direction back to the epoxy insulator 20, so that the epoxy insulator 20 can be conveniently poured in the subsequent step, unnecessary interference to pouring is avoided, meanwhile, installation of a tool required by a subsequent fracture test is facilitated, and the use convenience is improved. Place the connecting wire in lead wire groove 32 in, prevent to install other metal accessories in inserts chamber 33 and cause oppression or damage to the connecting wire, guarantee the signal ability normal transmission of connecting wire, improve high temperature foil gage 40's life.
And step 3: the strain sheet body is adhered to the arrangement position of the adhering surface of the metal insert 30, one end of a connecting wire is connected with the strain sheet body, and the other end of the connecting wire sequentially penetrates through the lead hole 31 and the lead groove 32 and then extends out of one end of the metal insert 30, which is back to the epoxy insulator 20, and is connected with the data acquisition device to form an insert data acquisition device; carry out data acquisition through the foil gage body, carry out data transmission through the connecting wire, data transmission to the data acquisition device that will meet an emergency the collection of the foil gage body, store and/or data processing through data acquisition device to data. Specifically, the data acquisition device can select a data acquisition card, the connecting wire is connected with the data acquisition card, and the data acquired by the data acquisition card on the strain sheet body is transmitted to the upper computer for analysis and processing.
And 4, step 4: and (3) pouring the epoxy insulator 20 of the GIL post insulator 10 by using the insert data acquisition device, acquiring the stress data of an epoxy-metal insert interface in the pouring process of the epoxy insulator by using the insert data acquisition device, and pouring the epoxy insulator 20 to form the experimental post insulator. The bonding surface of the epoxy insulator 20 and the metal insert 30 is the epoxy-metal insert 30 interface. The epoxy-metal insert 30 interface is a weak link in mechanical strength, not only in that the interface is the most stress-concentrated region under ideal conditions, but also because the epoxy material tends to form stress concentrations on the surface of the metal insert 30 during casting, resulting in uneven curing or weak bonding to form small air gaps. Therefore, not only needs to optimize the structural design, but also needs to improve the material formulation process to improve the bonding strength of the epoxy-metal interface. The high-temperature strain gauge 40 monitors the strain change of the epoxy-metal insert 30 interface of the epoxy insulator in the pouring process and monitors the strain change of the metal-epoxy interface in the whole process of pouring molding-fracture, compared with the method only monitoring the fracture process, the method is richer and more comprehensive, is more favorable for comparing the influence rules of different material formula processes on the interface bonding performance, and is more favorable for optimizing and improving the materials and process treatment methods of the epoxy and metal insert 30, so that the purpose of improving the bonding strength of the epoxy-metal insert 30 interface is achieved, and the failure rate of the GIL post insulator 10 is reduced.
Specifically, the method for detecting the interface stress of the GIL post insulator 10 includes, but is not limited to, detecting single-post and three-post insulators used in GIL equipment. The material of the epoxy insulator includes, but is not limited to, an epoxy resin composite material doped with Al2O3 filler, and the material of the metal insert 30 includes, but is not limited to, aluminum.
Further, the method comprises the following steps of 5: after the epoxy insulator 20 is poured, the experimental post insulator is subjected to a strain test experiment of externally applied force. Specifically, after the pouring data is collected, the connection between the high-temperature strain gauge 40 and the data acquisition card is disconnected. When the strain test experiment of the external application force is carried out, the connecting line of the high-temperature strain gauge 40 is connected with the data acquisition card again, and the strain test experiment of the epoxy-metal interface under the external application force is carried out according to the requirement. According to the method for detecting the interface stress of the GIL post insulator 10, provided by the invention, the strain of different positions of the epoxy-metal insert 30 interface in the pouring process of the insulator and the external force application process after the insulator is formed can be effectively detected in real time, the strain data of the 'forming-breaking' whole life process of the post insulator can be monitored, more information can be provided for solving the problem of breaking of the legs of the GIL post insulator 10, the monitoring data acquisition is more comprehensive, and the method has the characteristics of simplicity in operation, high efficiency and accuracy in detection, low cost, convenience in popularization and the like.
Further, in step 1, the placement location is determined from the stress distribution of the epoxy-metal insert 30 interface calculated from the simulation. Typically, the onset of fracture begins at the location where the stress is most concentrated, and therefore the stress distribution at the epoxy-metal insert 30 interface needs to be first simulated to find the location of the stress to be measured. As shown in fig. 3 to 6, specifically, three high temperature strain gauges 40 are provided on the metal insert 30, a first high temperature strain gauge a40 is provided at an axial position of the metal insert 30, a second high temperature strain gauge B40 is provided at an edge of the high temperature strain gauge 40 facing the bottom surface of the epoxy insulator, and a third high temperature strain gauge C40 is provided on a side surface of the metal insert 30, and strains ∈ at the three positions in a direction parallel to the surface of the metal insert 30 are measured.
Further, in step 4, an insert data acquisition device is installed in a mold for casting the epoxy insulator, and data of the change of the strain epsilon and the temperature T along with the time T during the casting process are monitored and acquired. And (4) analyzing the material formula process according to the corresponding relation of the epsilon-T-T.
Further, in step 5, the following substeps are included:
step 5.1: and taking the experimental post insulator out of the mold, carrying out a partial discharge test and an X-ray detection test on the experimental post insulator, and recording the position and the state of the strain gauge through the partial discharge test and the X-ray detection test.
Step 5.2: and recording the change data of the strain epsilon and the external application force F by performing a strain test experiment of the external application force F on the experimental post insulator. The interfacial strain test experiment of the epoxy-metal insert 30 under an applied tension F was performed and the data for "epsilon-F" was recorded.
Further, the method comprises the following steps of 6: and analyzing the material formulas and the processing techniques of the different epoxy insulators 20 by combining the data of the change of the strain epsilon and the temperature T along with the time T in the pouring process, the change data of the strain epsilon and the external application acting force F, the initial voltage of a partial discharge test and the final breaking strength of a strain test experiment.
Further, the high temperature strain gauge 40 is selected at least according to the highest temperature of the casting process of the epoxy insulator, the arrangement position and the strain direction needing to be strategic.
To sum up, the embodiment of the present invention provides a GIL post insulator 10, wherein a high temperature strain gauge 40 is disposed between an epoxy insulator and a metal insert 30, and the high temperature strain gauge 40 is disposed at different positions of an epoxy-metal interface, so as to monitor the interface strain change during the bonding failure process. Meanwhile, monitoring data can be directly obtained, indirect data obtained through a side monitoring method is not needed to be converted, monitoring efficiency is improved, and data accuracy is improved.
The embodiment of the invention provides a method for detecting the interface stress of a GIL post insulator 10, which can detect the change of the interface strain of an epoxy-metal insert 30 under the conditions of a pouring process and external application force in real time according to the defects that the method for detecting the interface strain of the epoxy-metal insert 30 of the GIL post insulator 10 has the defect of loss of strain data in the pouring link and the defect that the detection data in the fracture process is not direct and accurate enough, and has the advantage of 'monitoring the whole life cycle'. According to the method, the high-temperature strain gauge 40 with different parameters can be selected according to actual requirements, strain data of the epoxy-metal insert 30 interface in different positions and different directions in the casting molding and external force action process can be obtained, and the method has the characteristics of full life cycle, real-time performance, high efficiency, accuracy and the like.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A GIL post insulator is characterized in that: the high-temperature-resistant metal insert is characterized by comprising an epoxy insulator and a metal insert, wherein an insert mounting cavity is formed in the epoxy insulator, a high-temperature strain gauge is arranged on the outer surface of the metal insert, the metal insert is mounted in the insert mounting cavity, and the high-temperature strain gauge is located between the epoxy insulator and the metal insert.
2. The GIL post insulator of claim 1, wherein: the epoxy insulator and the metal insert are provided with a stress most concentration point, the high-temperature strain gauge and the stress most concentration point are provided with a preset distance L, and L is larger than 0.
3. The GIL post insulator of claim 1, wherein: the high-temperature strain piece comprises a strain piece body and a connecting wire, the strain piece body is connected with one end of the connecting wire, the other end of the connecting wire penetrates out of the metal insert, and the strain piece body is attached to the surface, facing the epoxy insulator, of the metal insert.
4. The GIL post insulator of claim 3, wherein: the metal insert is provided with a lead hole, the metal insert faces away from one end of the epoxy insulator, an insert cavity is formed in the end face of the insert cavity, a lead groove is formed in the inner side face of the insert cavity, the connecting wire is arranged in the lead groove, and the connecting wire sequentially passes through the lead hole and the lead groove faces away from the epoxy insulator and penetrates out in the direction.
5. A GIL post insulator interface stress detection method is characterized by comprising the following steps: the method comprises the following steps:
step 1: the high-temperature strain gauge is adhered to an adhering surface of the metal insert and the epoxy insulator, and the arrangement position of the high-temperature strain gauge on the metal insert GIL post insulator interface stress detection method is determined according to the required monitoring position;
step 2: according to the arrangement position, a lead hole is formed in the metal insert, an insert cavity is formed in one end, back to the epoxy insulator, of the metal insert, the lead hole extends to the insert cavity from the arrangement position, a lead groove is formed in the inner side face of the insert cavity, the high-temperature strain gauge comprises a strain gauge body and a connecting wire, and the depth of the lead groove is larger than the diameter of the connecting wire;
and step 3: the strain sheet body is adhered to the arrangement position of the adhering surface of the metal insert, one end of the connecting wire is connected with the strain sheet body, and the other end of the connecting wire sequentially penetrates through the lead hole and the lead groove and then extends out of one end of the metal insert, which is opposite to the epoxy insulator, and is connected with a data acquisition device to form an insert data acquisition device;
and 4, step 4: and pouring the epoxy insulator of the GIL post insulator by using the insert data acquisition device, acquiring stress data of an epoxy-metal insert interface in the pouring process of the epoxy insulator by using the insert data acquisition device, and finishing pouring the epoxy insulator to form the experimental post insulator.
6. The GIL post insulator interface stress detection method according to claim 5, wherein: comprises the following steps: and after the epoxy insulator is poured, the experimental post insulator performs a strain test experiment of the external application force.
7. The GIL post insulator interface stress detection method according to claim 6, wherein: in the step 4, the insert data acquisition device is installed in a mold for casting the epoxy insulator, and data of the change of the strain epsilon and the temperature T along with the time T in the casting process are monitored and acquired.
8. The GIL post insulator interface stress detection method according to claim 7, wherein: in the step 5, the following substeps are included:
step 5.1: taking the experimental post insulator out of the mold, and performing a partial discharge test and an X-ray detection test on the experimental post insulator;
step 5.2: and recording the change data of the strain epsilon and the external application force F by performing a strain test experiment of the external application force F on the experimental post insulator.
9. The GIL post insulator interface stress detection method according to claim 8, wherein: comprises the following steps of 6: and analyzing the material formula and the processing technology of different epoxy insulators by combining the data of the change of the strain epsilon and the temperature T along with the time T in the pouring process, the change data of the strain epsilon and the external application acting force F, the initial voltage of a partial discharge test and the final breaking strength of the strain test experiment.
10. The GIL post insulator interface stress detection method according to claim 5, wherein: and selecting the high-temperature strain gauge according to at least the highest temperature of the casting process of the epoxy insulator, the arrangement position and the strain direction needing a strategy.
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